I do plan on upgrading in the near future, maybe getting a better Video card, bigger processor, add a few drives....ect. Wich of these psu's will better suite my needs? Or should I upgrade from those 2?

I definately see those units powering your PC, but that's just me thinking out loud. I'm no expert, but I've got the impression 450W will pretty much run any system that's not completely obnoxiously fast

450 is fine right now, but the 420 wont be future proof, you will use it up quick. Get the 450, or you can get the OCZ Modstream or Powerstrean 520 for some $100. I have the Modstream 520, nice PSU, and looks sexy as hell.